tags: add --exclude option.

* tags.tl (tags-opts): Cumulative exlude option added.
(ftw-actionretval, ftw-continue, ftw-skip-subtree): These
variables are missing if we are not on Glibc, so we define
them as zero. These definitions help us take advantage of
FTW_ACTIONRETVAL to skip recursing into exluded subtrees.
(static-when): New macro.
(toplevel): Implement exclude option. Skipping directories on
platforms whose nftw function doesn't have FTW_ACTIONRETVAL is
simulated by keeping a dynamic skip list, which is
intelligently purged to keep it short.

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